== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:03:20 (1778537000)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 2.07724 s, 50.5 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.853908
Iter 1/10: OSS cache speed: 0.842122
Iter 1/10: ladvise speed: 0.784268
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.870658
Iter 2/10: OSS cache speed: 0.909911
Iter 2/10: ladvise speed: 0.988051
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.945505
Iter 3/10: OSS cache speed: 0.854138
Iter 3/10: ladvise speed: 0.982359
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.922106
Iter 4/10: OSS cache speed: 0.988447
Iter 4/10: ladvise speed: 0.974271
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.989068
Iter 5/10: OSS cache speed: 0.949311
Iter 5/10: ladvise speed: 0.929423
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.950719
Iter 6/10: OSS cache speed: 0.981529
Iter 6/10: ladvise speed: 1.1469
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.19781
Iter 7/10: OSS cache speed: 1.20968
Iter 7/10: ladvise speed: 1.44716
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.9612
Iter 8/10: OSS cache speed: 2.11588
Iter 8/10: ladvise speed: 2.28442
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.81271
Iter 9/10: OSS cache speed: 1.91389
Iter 9/10: ladvise speed: 1.92301
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.80801
Iter 10/10: OSS cache speed: 2.38457
Iter 10/10: ladvise speed: 2.45985
Average uncached read: 1.23
Average speedup with OSS cached read:  1.31 = +6.50%
Average speedup with ladvise willread:  1.39 = +13.00%
Speedup with OSS cached read less than 20%,  got 1.31%. Skipping ladvise willread check.